/*
 * Copyright (c) 2004-2010 The Trustees of Indiana University and Indiana
 *                         University Research and Technology
 *                         Corporation.  All rights reserved.
 * Copyright (c) 2004-2011 The University of Tennessee and The University
 *                         of Tennessee Research Foundation.  All rights
 *                         reserved.
 * Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
 *                         University of Stuttgart.  All rights reserved.
 * Copyright (c) 2004-2005 The Regents of the University of California.
 *                         All rights reserved.
 * Copyright (c) 2006-2013 Los Alamos National Security, LLC.
 *                         All rights reserved.
 * Copyright (c) 2009-2012 Cisco Systems, Inc.  All rights reserved.
 * Copyright (c) 2011      Oak Ridge National Labs.  All rights reserved.
 * Copyright (c) 2013-2016 Intel, Inc.  All rights reserved.
 * Copyright (c) 2015      Mellanox Technologies, Inc.  All rights reserved.
 * $COPYRIGHT$
 *
 * Additional copyrights may follow
 *
 * $HEADER$
 *
 */

#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>

#include <pmix.h>

static pmix_proc_t myproc;
static bool completed;

static void notification_fn(size_t evhdlr_registration_id,
                            pmix_status_t status,
                            const pmix_proc_t *source,
                            pmix_info_t info[], size_t ninfo,
                            pmix_info_t results[], size_t nresults,
                            pmix_event_notification_cbfunc_fn_t cbfunc,
                            void *cbdata)
{
    fprintf(stderr, "Client %s:%d NOTIFIED with status %d\n", myproc.nspace, myproc.rank, status);
    completed = true;
}

static void op_callbk(pmix_status_t status,
                      void *cbdata)
{
    fprintf(stderr, "Client %s:%d OP CALLBACK CALLED WITH STATUS %d\n", myproc.nspace, myproc.rank, status);
}

static void errhandler_reg_callbk(pmix_status_t status,
                                  size_t errhandler_ref,
                                  void *cbdata)
{
    fprintf(stderr, "Client %s:%d ERRHANDLER REGISTRATION CALLBACK CALLED WITH STATUS %d, ref=%lu\n",
               myproc.nspace, myproc.rank, status, (unsigned long)errhandler_ref);
}

int main(int argc, char **argv)
{
    int rc;
    pmix_value_t value;
    pmix_value_t *val = &value;
    pmix_proc_t proc;
    uint32_t nprocs;

    /* init us */
    if (PMIX_SUCCESS != (rc = PMIx_Init(&myproc, NULL, 0))) {
        fprintf(stderr, "Client ns %s rank %d: PMIx_Init failed: %d\n", myproc.nspace, myproc.rank, rc);
        exit(0);
    }
    fprintf(stderr, "Client ns %s rank %d: Running\n", myproc.nspace, myproc.rank);

    PMIX_PROC_CONSTRUCT(&proc);
    (void)strncpy(proc.nspace, myproc.nspace, PMIX_MAX_NSLEN);
    proc.rank = PMIX_RANK_WILDCARD;

    /* get our universe size */
    if (PMIX_SUCCESS != (rc = PMIx_Get(&proc, PMIX_UNIV_SIZE, NULL, 0, &val))) {
        fprintf(stderr, "Client ns %s rank %d: PMIx_Get universe size failed: %d\n", myproc.nspace, myproc.rank, rc);
        goto done;
    }
    nprocs = val->data.uint32;
    PMIX_VALUE_RELEASE(val);
    fprintf(stderr, "Client %s:%d universe size %d\n", myproc.nspace, myproc.rank, nprocs);
    completed = false;

    /* register our errhandler */
    PMIx_Register_event_handler(NULL, 0, NULL, 0,
                                notification_fn, errhandler_reg_callbk, NULL);

    /* call fence to sync */
    PMIX_PROC_CONSTRUCT(&proc);
    (void)strncpy(proc.nspace, myproc.nspace, PMIX_MAX_NSLEN);
    proc.rank = PMIX_RANK_WILDCARD;
    if (PMIX_SUCCESS != (rc = PMIx_Fence(&proc, 1, NULL, 0))) {
        fprintf(stderr, "Client ns %s rank %d: PMIx_Fence failed: %d\n", myproc.nspace, myproc.rank, rc);
        goto done;
    }

    /* rank=0 calls abort */
    if (0 == myproc.rank) {
        sleep(2);
        fprintf(stderr, "Client ns %s rank %d: exiting with error\n", myproc.nspace, myproc.rank);
        exit(1);
    }
    /* everyone simply waits */
    while (!completed) {
        struct timespec ts;
        ts.tv_sec = 0;
        ts.tv_nsec = 100000;
        nanosleep(&ts, NULL);
    }

 done:
    /* finalize us */
    fprintf(stderr, "Client ns %s rank %d: Finalizing\n", myproc.nspace, myproc.rank);
    PMIx_Deregister_event_handler(1, op_callbk, NULL);

    if (PMIX_SUCCESS != (rc = PMIx_Finalize(NULL, 0))) {
        fprintf(stderr, "Client ns %s rank %d:PMIx_Finalize failed: %d\n", myproc.nspace, myproc.rank, rc);
    } else {
        fprintf(stderr, "Client ns %s rank %d:PMIx_Finalize successfully completed\n", myproc.nspace, myproc.rank);
    }
    fflush(stderr);
    return(0);
}
